a/an: when we mention sth for the first time, with singular nouns only, the: when we mention sth for the second time, when sth is unique (the Moon, the Earth etc), names of the countries with states, federations etc. (the USA etc), no article: with groups in general (Dogs are smarter than cats), with people's names (Kevin, Sue etc), with single names of countries (Uganda, France etc),

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